iso_8859-13.7: Charset pages unification, minor cleanups

- adjust references
- remove stray comments
- cosmetics

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/iso_8859-13.7

@@ -29,9 +29,8 @@ and hexadecimal
 .SH DESCRIPTION
 The ISO 8859 standard includes several 8-bit extensions to the ASCII
 character set (also known as ISO 646-IRV).
-ISO 8859-13 encodes the characters used in Baltic Rim languages.
-.\" In my system with glibc-2.8-20080929 is used for
-.\" Lithuanian, Latvian and the Maori language in New Zealand.
+ISO 8859-13 encodes the
+characters used in Baltic Rim languages.
 .SS ISO 8859 alphabets
 The full set of ISO 8859 alphabets includes:
 .TS
@@ -57,8 +56,6 @@ The following table displays the characters in ISO 8859-13, which
 are printable and unlisted in the
 .BR ascii (7)
 manual page.
-.\" The fourth column will only show the proper glyphs
-.\" in an environment configured for ISO 8859-13.
 .TS
 l l l c lp-1.
 Oct	Dec	Hex	Char	Description
@@ -163,4 +160,6 @@ _
 .SH NOTES
 ISO 8859-13 is also known as Latin-7.
 .SH SEE ALSO
-.BR ascii (7)
+.BR ascii (7),
+.BR charsets (7),
+.BR utf-8 (7)